Python for Network Engineers

This repo contains Scripts which are explained in the YouTube Channel NetworkEvolution

List of Directories in this Repository:

Summary of each Directory

Directory : 00_Python_Scripts_from_Youtube_Playlist

This directory contains all the Scripts explained in the below YouTube playlist which has more than 70 Videos.

Training starts from a very beginner level like:
How to initiate SSH Connection to the Device using Paramiko
To Intermediate level of Using NETCONF/YANG, RESTCONF etc

List of all the Scripts

Click here for Complete Videos Playlist In YouTube :Python Learning for Network Engineers

For the Complete Scripts and Video maps please access the folder "`00_Python_Scripts_from_Youtube_Playlist`" in this Repository

These Python scripts Contains Tutorials on:

Paramiko
Netmiko
Nornir
NAPALM
Ansible
NETCONF/YANG
RESTCONF
Regex For Parsing
CSV for Bulk Configuration
How to use text file for Configuration

Directory : 01_Paramiko_Sample_Scripts

This directory contains Scripts which explains how to use Paramiko Library for communicating with Cisco Devices.

Demonstrates the use of SSH Hostkey policy. Different ways to use hostkey policies :

session.set_missing_host_key_policy(paramiko.AutoAddPolicy())
session.load_host_keys('/home/evolve/.ssh/known_hosts')
session.set_missing_host_key_policy(paramiko.WarningPolicy())

SSH Keybased Authentication Using Paramiko:
Paramiko SSH exec_command Example
Paramiko invoke_shell example
SSH Password Based Authentication

List of Scripts in the Directory

01_ssh_host_key_policy.py
02.1_ssh_key_cisco_exec_command.py
02.2_ssh_key_cisco_invoke_shell.py
02.3_ssh_key_cisco_invoke_shell_fn.py

Click here for Complete Paramiko Scripts Tutorial Playlist In YouTube :01_Paramiko_Sample_Scripts

For the Complete Scripts and Video maps please access the folder "`01_Paramiko_Sample_Scripts`" in this Repository

Directory : 02_Configure_Device_Using_CSV

This directory contains Scripts which explains how to read Device IP Address and configuration lines from CSV file and configure respective devices using Python.

Sample CSV FIle Used for Configuring the Device :

The above CSV file will create a Dictionary in below format

conf_dict={'192.168.0.50': ['terminal len 0',
                  'config t',
                  'int gi1',
                  'no shut',
                  'exit',
                  'exit',
                  'show ip int brie',
                  'show run int gi1'],
 '192.168.0.51': ['terminal len 0',
                  'config t',
                  'int lo0',
                  'ip add 10.0.0.1 255.255.255.0',
                  'int lo1',
                  'ip add 11.0.0.1 255.255.255.0',
                  'do show run int loopback0',
                  'do show run int loopback1'],
 '192.168.0.53': ['terminal len 0', 'config t', 'int gi3', 'no shut'],
 'csr1.test.lab': ['terminal len 0',
                   'config t',
                   'int gi2',
                   'no shut',
                   'ip address 2.2.2.2 255.255.255.0',
                   'exit',
                   'exit',
                   'show ip int brie',
                   'show run int gi2']}

List of Scripts in the Directory

01_config_in_row.csv : How to read Content from CSV file in row format : Script Demonstration Videos
01_csv_reader_row.py : How to read Content from CSV file Using Reader format : Script Demonstration Videos
02_config_in_column.csv : How to read Content from CSV file in Column format :Script Demonstration Videos
02_csv_reader_column.py : How to read Content from CSV file in Column format using Reader : Script Demonstration Videos
03_csv_DictReader_column.py : How to read Content from CSV file in Column format using DictReader :Script Demonstration Videos

Click here for Complete CSV Videos Playlist In YouTube :02_Configure_Device_Using_CSV

For the Complete Scripts and Video maps please access the folder "`02_Configure_Device_Using_CSV`" in this Repository

Directory : 03_Cisco_Config_Parser_Regex

This directory contains Scripts which explains how to parse configuration lines from Cisco Devices Using Regex in Python

Sample Parsed Output :

*Show Version Parser

*Show Running Config Parser Output:

Regex Patterns Used for Show Version Parser:

version_pattern = re.compile(r'Cisco .+ Software, Version (\S+)')
model_pattern = re.compile(r'cisco (\S+).+bytes of memory\.')
serial_no_pattern = re.compile(r'Processor board ID (\S+)')
uptime_pattern = re.compile(r'(.+) uptime is (.*)')

Regex Patterns Used for Show running Parser:

hostname_pattern = re.compile(r'hostname (\S+)')
domainname_pattern = re.compile(r'ip domain name (.+)')
pid_pattern = re.compile(r'license udi pid (\w+) sn (\S+)')
netconf_pattern = re.compile(r"netconf-yang\r\n")
username_pattern = re.compile(r'username (\S+) privilege (\d{2})')
interface_pattern = re.compile(r'interface (\S+[.]?\d*)\r\n.+?\r?\n?\s?ip address ([\d\.]+) ([\d\.]+)')
interface_prop_pattern = re.compile(r'interface (?P<name>\S+[.]?\d*)\r\n\s?.+?\r?\n?\s?ip address (?P<ip_aadress>[\d\.]+) (?P<mask>[\d\.]+)')
default_route_pattern = re.compile(r'ip route 0.0.0.0 0.0.0.0.+?([\d.]+)\r\n')
static_route_pattern = re.compile(r'ip route (?P<dst_subnet>[^0][\d\.]+) (?P<mask>[^0][\d\.]+) (?P<next_hop>[\d\.]+)')

List of Scripts in the Directory

01_parse_Show_ver_SSH.py : Parse Show Version Output over SSH : Script Demonstration Videos
01_parse_show_ver_from_file.py : Parse Show Version Output from Text file : Script Demonstration Videos
02_parse_show_run_from_file.py : Parse Show Run Output from Text file :Script Demonstration Videos
02_parse_show_run_from_SSH.py : HParse Show Run Output from SSH : Script Demonstration Videos
command_output_to_txt.py : Save Multiple Show Commands to text file :Script Demonstration Videos

Click here for Complete Cisco Configuration Parsing Videos Playlist In YouTube

For the Complete Scripts and Video maps please access the folder "03_Cisco_Config_Parser_Regex" in this Repository